Wolf–Rayet (WR) can mean:
*
Wolf–Rayet star
Wolf–Rayet stars, often abbreviated as WR stars, are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of ionised helium and highly ionised nitrogen or carbon. The spectra indicate very high surface ...
, a type of evolved, massive star
*
Wolf–Rayet galaxy
A starburst galaxy is one undergoing an exceptionally high rate of star formation, as compared to the long-term average rate of star formation in the galaxy or the star formation rate observed in most other galaxies. For example, the star formatio ...
, which contains large numbers of Wolf–Rayet stars
*
Wolf–Rayet nebula
A Wolf–Rayet nebula is a nebula which surrounds a Wolf–Rayet star.
WR nebulae have been classified in various ways. One of the earliest was by the nature and origin of the nebula:
* HII regions
* ejecta-type nebulae
* wind-blown bubbles
Th ...
, which surrounds a Wolf–Rayet star
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